The sound comes from Harry Potter and the Chamber of Secrets, released in 2002, where Molly Weasley sends Ron a Howler that erupts in the Great Hall and shouts at him for taking the flying car. Played by Julie Walters, Molly became a shorthand online for the furious but loving parent, and short clips of her shouting Ron's full name spread across edits, reaction videos and soundboards. Using the full name signals serious trouble in British households, which helps explain why the clip still works far beyond the original scene.